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Related Concept Videos

Population Growth00:57

Population Growth

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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

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Exponential models are essential for describing rapid, multiplicative changes in natural systems, such as population growth. When a population doubles at regular intervals, the process can be modeled using a suitable base. For instance, a bacterial culture that doubles every three hours follows the model n(t)=n0⋅2t/3, where n(t) is the population at the time t.A more general model uses the natural base e, especially for continuous growth. This takes the form n(t)=n0⋅ert, where r is...
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Related Experiment Video

Updated: Dec 18, 2025

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
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Future Interstate Highway System Demands: Predictions Based on Population Projections.

Guangqing Chi1, Donghui Wang2, Annelise DeJong Hagedorn3

  • 1Department of Agricultural Economics, Sociology, and Education, Population Research Institute, and Social Science Research Institute, The Pennsylvania State University, 112E Armsby, University Park, PA 16802, USA.

Case Studies on Transport Policy
|June 17, 2020
PubMed
Summary

Population growth is projected across the US, with varying regional changes. This demographic forecast aids in planning future Interstate Highway System (IHS) investments and expansions.

Keywords:
Interstate Highway Systemcohort component methoddemographic forecastingpopulation changepopulation projectionspatial overlay

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Area of Science:

  • Demography
  • Transportation Planning
  • Geographic Analysis

Background:

  • The Interstate Highway System (IHS) requires upgrades to meet 21st-century demands.
  • Demographic forecasting is crucial for effective transportation planning.
  • Recent policy indicates a desire to restore and expand the IHS.

Purpose of the Study:

  • To provide county-level US population projections to 2060.
  • To identify areas of projected population growth and decline.
  • To inform decisions regarding IHS expansion and investment.

Main Methods:

  • Cohort-component demographic projection methods.
  • County-level analysis across the entire US.
  • Integration of population projections with IHS network proximity.

Main Results:

  • Projected US population growth across all age groups by 2060.
  • Identified regional population growth hotspots (West/South/East border states, Atlanta-NC-Nashville triangle).
  • Identified regions of population decline (Northeast, Appalachia, Great Lakes, Mississippi River, Deep South, Alaska).

Conclusions:

  • Significant regional variations in population change necessitate tailored transportation infrastructure planning.
  • Specific counties with high density, growth, and lacking IHS access require attention.
  • Demographic forecasts are essential for strategic IHS investment decisions, considering factors like aging populations and autonomous vehicles.